A hotfix release "release211a" is available in tdm_installer. Right now you need to select this version manually. As usual, the savegames are compatible both ways between 2.11 and 2.11a. In fact, the hotfix uses the same executable files, so there is almost no risk of breaking anything. We only fixed a bug with wrong map icons in one def file. Please update your 2.11 installation to this version. It is very unlikely you can meet any issues, but if you do, report them here 😀